Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 04e515ff8ac7881a…

MALICIOUS

Office (OOXML) / .XLSX

2.95 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: f1dd5f0dbf3519f56a3f65c846e56e33 SHA-1: 219dab1edc12abface5a1027d7d7db0cdf8ac51c SHA-256: 04e515ff8ac7881aaaf36cba57ee3bc63f9b627226689ebf5dccf566c42a7d42
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/adDIjrqf1.vHs contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c8dc6a06b70cbe1e92bc18740fcc44f96377da9789b83d82b015b7c1fb18feb7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/adDIjrqf1.vHs 3034624 bytes
ooxml_oleobject_00_ole10native_00.bin
c3c7ba0fc68b7375db303190beb28a8478418bb3bd1b92105ec830b112cfad70		 ole-package OOXML xl/embeddings/adDIjrqf1.vHs Ole10Native stream: OLe10natIVE 3008304 bytes

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